By 80%, do you mean you're getting about 80% of the questions correct? That could already be a very good figure - it depends upon the difficulty level of the questions that you're answering. (Note: I'm assuming you're talking about doing questions out of the book in a non-adaptive format. If you're getting 80% correct on an adaptive test, then that is an AMAZING performance and you shouldn't be worried about RC!)
Honestly, even just out of the book, 80% correct is a pretty good performance already. The test isn't scored based upon percentage correct, so focusing on percentage correct in practice isn't really the best way to gauge your improvement. In fact, I can't even really tell anything about someone's performance when they tell me the percentage correct, because it all depends upon the difficulty levels of the questions you're answering.
RC can be improved in months, not years, but it is also true that RC is also one of the harder areast to improve quickly. And, yes, a lot of it is a matter of practice. Just note that it's not about doing a million practice questions - you need to learn something from every problem that you can then apply to future problems. Then think about how to make that new thing a
consistent habit.
For instance, you mentioned that sometimes you make the mistake of not checking every answer choice before picking an answer. Do you write ABCDE on your scrap paper? Do you make a symbol next to EVERY letter on EVERY problem before picking an answer? Start doing that every single time.
You need four symbols:
- definitely wrong (I use an X)
- maybe (I use a squiggle)
- I have no idea (I use a question mark)
- this is the right one! (I use a check mark)
You can use any symbols you want as long as you consistently use the same symbols all the time.
Next, on verbal, you should ALWAYS make 2 passes through the answers. On the first pass, you can use one of two symbols: the "definitely wrong" and the "maybe." DO NOT CHOOSE on the first pass.
Then, go look through again and choose. If you have four Xs and one squiggle (if you're using my symbols!), then you can just pick the squiggle. If you have three Xs and two squiggles, then you can examine the two squiggles more carefully. And so on.
Now, start making yourself do that every time. If you do a problem where you forget to do that and you realize halfway through or after you're done, make yourself do the entire thing from the start again, using the symbols and keeping track. The pain of doing that a few times will help you to make it a habit. :)
Generally, focus on one topic during one study session. One study session is 1.5 to 2 hours. You may have more than one study session in a day, but make sure to take a break for at least an hour betwen study sessions (otherwise, your brain gets too tired and you can't make new memories as well, so you're just wasting your time).
You may find this article useful:
http://www.beatthegmat.com/mba/2010/09/ ... your-study